CERTIFICATE OF RE-ENTRYOrbital Register™ · by Orbital Radar™
Entry no.
1990-0271
DELTA 1 R/B(2)
DELTA 1 R/B(2) (NORAD 13939) re-entered Earth’s atmosphere on 28 May 1990, after 17 years, 1 month in orbit.
Official date
NORAD number
13939
International designator
1973-023C
Object type
Rocket body
Country
United States
Launched
20 Apr 1973Cape Canaveral
Re-entered (UTC)
28 May 1990UTC calendar day
Time in orbit
17 years, 1 month6,247 days
How it ended
Re-entered (natural decay)
Latitude range
26.2°N to 26.2°SFinal inclination 26.2°
Mass
1,047 kg
Where it came down
Latitude band its orbit allowedExact position not recorded
No position was recorded for this re-entry. Its final orbit, inclined at 26.2°, allowed a re-entry anywhere between 26.2°N and 26.2°S.
Life in orbit
17 years, 1 monthDELTA 1 R/B(2)’s lowest and highest points above Earth, week by week, from its tracking history.
Also ended on 28 May 1990
3 entriesFrom the same launch
1973-023
Entered in the Orbital Register™, founding volume, September 2026.
Record version 1 · No corrections · orbitalradar.com/register/1990-0271
© 2026 Orbital Radar. Cite this entry by its number; the register itself may not be copied.
Record version 1 · No corrections · orbitalradar.com/register/1990-0271
© 2026 Orbital Radar. Cite this entry by its number; the register itself may not be copied.